First slide

Atomic and physical properties

Question

Which is true for an element R present in group 13 of the periodic table

Moderate

A

It is a gas at room temperature
B

It has oxidation state of +4
C

It forms R₂O₃
D

It forms RX₂

Solution

All 13^th group elements are solids at room temperature ,except "Ga" ,Ga exist as liquid at room temperature .
→ 13^th group elements maximum oxidation state is +3 due to the presence of three valence electrons in their valency shell.
→ 13^th group elements forms the oxides with the formula M₂O₃[ R₂O₃ ].
→ 13^th group elements forms the halides with the formula MX₃ [RX₃],since their valency is three ,therefore they will combine with three halogen atoms.
For writing formula of the compound we need to follow above shown CRISS-CROSS METHOD.

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